Improved stringe



NFEEHS. PROT GRAFHER. WASHINGTON. D. C.

tlaite te'. A

JAMES J. ESSEX, OF NEWPORT, RHODE ISLAND.

Laim Patent No. 89,393, dated apra 27, 1869.

IMPROVED SYRINGE.

cork- The Schedule referred to in these Letters Patent and making part of thu im *.H

To all 'whom 'it may concern.-

Be it known that I, J AMES J. ESSEX, of N ewport, in the county of Newport, and State of Rhode Island, have invented a new and improved Syringe; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had tothe accompanying drawing forming part of this specification;

The drawing represents a side view partly in section of my improved syringe.

Similar letters of reference indicate corresponding parts.

The object of this invention is to so arrange the discharge-pipe of an elastic-bulb syringe, that the admission to and the consequent discharge of air fromthe said pipe cannot take place, as long as liquid matter is forcedthrough the same. The elastic-bulb syringes heretofore used were each provided with a straugulated valve, in the discharge-pipe, though which air was not only freely admitted, but also discharged, occasioning much inconvenience and frequent pai` Such single valve did also gencrally'til to close quick enough to prevent the return into the syringe of the injected liquid, whereby the object ofthe injection was partly destroyed and the syringe itself made offensive.

My invention consists in providing the elastic or rigid discharge-pipe of an elastic-bulb syringe with two valves, one at or near each end; thereby all the aforesaid inconveniences are entirely and mosteifectually overcome.

The entrance of air into the discharge-pipe through the inner valve-box is thereby made absolutely impossible, as the inner valve will close immediately after pressure ou the bulb ceases. The entrance of air through the outer valve-box is also prevented, as a column of liquid matter remains in the discharge-pipe upon the closed inner valve as soon as pressure upon the bulb is stopped.

The return of injected and other matter into the syringe is also preyented by the aforesaid sustaining column of liquid in the discharge-pipe, even if the outer valve should not close with requisite promptncss. Furthermore, by this arrangement the necessity of strangulat-ing the valves is overcome; greater freedom of play can be allowed the same, and a consequent larger stream can, with less friction, be passed through a pipe, through which with the old system a much smaller column of liquid could be thrown.

'A in the drawing represents the suction-pipe, B, the elastic bulb, and C, the discharge-pipe of the syringe. The suction and discharge-pipes can' be partly or wholly elastic, or rigid, as may be desired.

In l.the suction-pipe is arranged a valve-box, a, with a valve, b, in the ordinary or suitable manner. In the discharge-pipe are arranged two valve-boxes, c and d, the one near the inner, the other near the outer end ofthe same, as shown. v

Suit-able valves ej, are arranged in these valveboxescfl, respectively as shown. The valves e f both open outward when pressure is applied to the bulb, and close upon their seats inwardly when the pressure is removed.

I do not claim, or confine myself .to any particular arrangement of pipes, nor to any peculiar construction of nozzle, valve-boxes, and valves; but

What I claim as'new, and desire to secure by Letters Patent, is I Providing the discharge-pipe C, of a bulb-syringe with two valve-boxes and valves at or. near the outer and inner ends of the same, respectively, substantially' as herein shown and described,lfor the purpose speci- The above specification of my invention signed by me, this 11th day of February, 1869.

JAMES J. ESSEX. Witnesses:

FRANK BLooKLEY, E. GREENE COLLINS. 

